Contents. planet: 7 - Uranus satellites: U1-Ariel : 15, U2-Umbriel : 17, U3-Titania : 53, U4-Oberon : 58 total number: 143 type: relative dates: 1863-1865 observatory: Malta, latitude 25 deg 55' References. Lassel W. (1867) Observations of Planets and Nebulae at Malta. Memoirs of the Royal astronomical society. V. 26. P. 1-32. 1867MmRAS__36____1L Informations. relative to: planet reference frame: apparent centre of frame: topocentre epoch of equinox: date time scale: Grinwich Mean Time reduction: no information coordinates: position angle and separation diff. refraction: no information receptor: micrometric telescope: Equatoreal, D=2-foot observers: W. Lassel data included in standard data file: no Comments. no information Format. 1. Observed satellite number (N sat) 2. Year of the moment of observation 3. Month of the moment of observation 4. Day of the moment of observation 5. Hour of the observation 6. Minute of the observation with decimals 7. P (position angle) in degrees (999.9 if not given) 8. S (separation) in arcsec (-99.99 if not given) -------------------------------------- N Year G.M.T. sat month h m P S day degrees arcsec --------------------------------------